Originally Posted by Amydaveg 
Is there a way to set this camera on an automatic mode that would fix this?
You can use exposure compensation, and flash exposure compensation, but your best bet is to shoot in Manual with the flash set to p-ttl.
I have the same flash, and K200D, and have had great results indoors. If you bounce or diffuse the flash, add .5 or 1 stop to the flash exposure compensation.